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authorFurquan Shaikh <furquan@chromium.org>2016-12-01 07:12:32 -0800
committerFurquan Shaikh <furquan@google.com>2016-12-05 03:29:04 +0100
commit94f8699d447ef94df339d318b836b664273e89ff (patch)
tree17223ccd5906a8087251beabc943786cade37ee4 /src/drivers/spi/spi-generic.c
parent36b81af9e8ecea2bf58aae9a421720ed10f61b82 (diff)
downloadcoreboot-94f8699d447ef94df339d318b836b664273e89ff.tar.xz
spi: Define and use spi_ctrlr structure
1. Define a new structure spi_ctrlr that allows platforms to define callbacks for spi operations (claim bus, release bus, transfer). 2. Add a new member (pointer to spi_ctrlr structure) in spi_slave structure which will be initialized by call to spi_setup_slave. 3. Define spi_claim_bus, spi_release_bus and spi_xfer in spi-generic.c which will make appropriate calls to ctrlr functions. BUG=chrome-os-partner:59832 BRANCH=None TEST=Compiles successfully Change-Id: Icb2326e3aab1e8f4bef53f553f82b3836358c55e Signed-off-by: Furquan Shaikh <furquan@chromium.org> Reviewed-on: https://review.coreboot.org/17684 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/drivers/spi/spi-generic.c')
-rw-r--r--src/drivers/spi/spi-generic.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/src/drivers/spi/spi-generic.c b/src/drivers/spi/spi-generic.c
new file mode 100644
index 0000000000..7398ee928f
--- /dev/null
+++ b/src/drivers/spi/spi-generic.c
@@ -0,0 +1,43 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <spi-generic.h>
+#include <string.h>
+
+int spi_claim_bus(const struct spi_slave *slave)
+{
+ const struct spi_ctrlr *ctrlr = slave->ctrlr;
+ if (ctrlr && ctrlr->claim_bus)
+ return ctrlr->claim_bus(slave);
+ return 0;
+}
+
+void spi_release_bus(const struct spi_slave *slave)
+{
+ const struct spi_ctrlr *ctrlr = slave->ctrlr;
+ if (ctrlr && ctrlr->release_bus)
+ ctrlr->release_bus(slave);
+}
+
+int spi_xfer(const struct spi_slave *slave, const void *dout, size_t bytesout,
+ void *din, size_t bytesin)
+{
+ const struct spi_ctrlr *ctrlr = slave->ctrlr;
+ if (ctrlr && ctrlr->xfer)
+ return ctrlr->xfer(slave, dout, bytesout, din, bytesin);
+
+ return -1;
+}